During a recent show the 17-year-old wore a custom shirt made from sewn together bits of Rob Zombie, Type O Negative, and Cradle of Filth tees, and the featured bands couldn't be more happy. In fact, all three of them took to social media to praise the "Bad Guy" singer.

"Billie Eilish is certainly a unique and bad a** superstar who absolutely walks her own path. How awesome is it to see the Type O support!! #billieeilish" Type O Negative wrote on Facebook.

"Whatever you think of Billie Eilish, she’s got some seriously good taste in gothic-tinged music if a coat made from Type O Negative, Rob Zombie and Cradle artwork is anything to go by. @billieeilish." Cradle of Filth posted on Instagram.

Aside from championing metal in her personal style, Eilish is also currently selling a beanie with her name in the style of a death-metal logo in her merch store. Rock on.